Tree picker for cmdb_model_picker table

[NishigandhaL]

Am using tree picker on the cmdb_model_category table on parent_category field but even after adding attribute tree_picker =true it is not showing the data in hierarchichal way. 

[Huynh Loc]

Hi @NishigandhaL ,
I reproduce in PDI and faced the same issue. I think this is a known error, and we need to open a support case.
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